Piston



y 30- J. D. LANGDON 1,757,016

PISTON Filed Sept. 11 1928 F1E-l- FHlE.

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. d er of smaller di Patented May 8, 193$ rrnn sa'rr JESSE D. tnnsnom on LOS ANenLEs, CALIFORNIA,

PIST

Application filed September 11, 1928. seriaiNo. 305,150.

The invention relates to im pistons, particularly for use in pumps and kindred devices, althoughthe piston may be used in amo-dified form in som'eftypes of engines. a

My invention has for its primary object the provision of a novel compressible sheet metal piston member, adapted to expand from pressure and bear against the Wall of the Cylinder in which said piston is used.

Another object in my invention. is to proyide a metal piston adapted to prevent the lay-passing of pressure between the cylinder Welland-piston Without the use of piston rings or kindred devices.

Other as the descri illustrate-d b Fig. 1 is a piston. I 1

Fig, 2 isa diametrical section thereof Fig. 3 is a greatly enlarged and exaggerated edge View of the rim of the piston, show-f ing the approximate line along which the metal is removed. g i

The piston is of cup-shape, being pressed from suitable metal and having a flared rim. Thelcompression of the metal of the rim prouces minute or microscopic folds, as suggested in Fig. 8, and the outer surface of the rim is machined oil on the line 11, as'indicated in Fig. 3, so as to remove the outer folds. The machined surface 2 is substantially cylindrical to it the Wall of'thecylinder, and the rim has a feather edge 3 that bears snugly against the cylinder wall. The metal'is pulled across thesplit portions by the drag 'oflthe machining tool, so that the severed edges of the folds of m-etalare actually interlapped; This not only seals the edge of the piston against leakage. but assists the expansion and provements' in ption proceeds, and the piston is y the drawings, in which,

objects inmy invention Will appear if gether with the sprin tend to hold the rim o surrounding cylinder take up We the piston.

Having thus g tension of the metal, f the piston against the Wall at all times and ar between the-cylinder all and is claimedas-new is:

A i'ng across and lengthw splits with the t'erlap When th cylinder.

perspective vieyv of the improved contraction to take place more freely at the feather edge 3 ca rim. a

In use the piston is compressed into acylinameter, than the piston memher and the folds of the metal at the edge of the rim allow the metalto close together and interlap, as the case may be. The exerting of pressure on the inside of the piston rim, to-

used by the machining of the piston comprising a sheetmetal c a rim wherein the metal is folded pression and sald run be up having mach ise said folds to produce split portions adapted to in e piston is compressed into a JESSE D. transport-.-

ined 01f scribed the invention, what by com- 

